Heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) have provided strong evidence indicating the formation of the strongly coupled quark-gluon plasma (QGP), a deconfined state of hadronic matter whose dynamics after the collision is dominated by non-perturbative effects [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]}. While the perturbative QCD works only in the weak coupling regime, the string/gauge duality can be used as the powerful tool fo study the strongly coupled plasma [9]}, [10]}, [11]}, [12]}, [13]} .
